KABUL—Human Rights Watch called Monday on the Afghan government to reject a proposal to reintroduce public stoning as a punishment for adultery, but the Justice Ministry denied that such a law had been submitted.

A working group that is assisting in drafting Afghanistan’s new penal code has proposed provisions on “moral crimes” involving sex outside of marriage that call for stoning, the human rights organization said. The group is led by the Justice Ministry.

“International donors, including those supporting the legal reform process, should send a clear message to President Hamid Karzai that inclusion of stoning in the new penal code would have an immediate adverse effect on funding for the government,” the group said.

But Mohammad Ashraf Azimi, head of the Justice Ministry’s punishment laws department, said such a proposal had not yet been submitted for review.

“I haven’t seen this part of the law they are mentioning,” he said. “I don’t know where they found it and why they are emphasizing it. We are the people working on it and we haven’t seen it.”

He said at least two more years are needed to complete the new penal code, intended to replace one in effect since 1976. He said international organizations were heavily involved in the process, which began two years ago.

Azimi said one working group was dealing with Islamic sharia law because Afghanistan is an Islamic republic. That group, he said, was drafting various proposals for issues such as adultery, which currently is a crime in Afghanistan punishable with up to 15 years imprisonment.

Stoning was used as a punishment for adultery during the Taliban government, which ruled from the mid-1990s until late 2001, when it was overthrown by the American invasion.

Azimi’s remarks came as Afghanistan’s Interior Ministry ordered an investigation Monday into the case of a couple allegedly shot by their relatives for adultery. The killing, said to have taken place in a Taliban-dominated area of northern Baglan province on Saturday, was based on what the ministry described as an illegal decision taken by tribal elders.

Such so-called honour killings are common in Afghanistan’s highly conservative Islamic society, particularly in areas controlled by the Taliban.

According to Khadija Akhil, provincial head of women’s affairs, a 28-year-old man and 25-year-old woman, who were both married to other people, fled the village of Joye Naw but their car broke down.

“They were caught and when police went to the area the villagers said they were punished according to our culture,” she said.

Akhil said the villagers were originally going to stone them, but shot them instead. She added that they then gouged out the man’s eyes and hacked his body with knives.

The ministry said police have been ordered to arrest those responsible.